Shunt Resistor Mounting Structure Reducing Parasitic Inductance
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Solution Overview
Problem
Existing shunt resistor mounting structures face challenges in suppressing parasitic inductance errors due to the length of the resistive element, leading to complex structures and difficulties in the wire forming step.
Innovation Solution
A shunt resistor mounting structure is designed with a pair of terminal portions connected to a mounting board featuring a lead-out line portion and a wire, where the lead-out line and wire intersect, reducing the loop area and simplifying the structure to minimize parasitic inductance effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If line patterns are arranged in the same direction as current flow with certain length to create mutual inductance, then sensing error caused by parasitic inductance is reduced, but device complexity and number of manufacturing steps increase
Solution Approach 1:
The patent transitions from planar arrangement of line patterns to a three-dimensional configuration where a wire is positioned above the substrate surface. This spatial separation allows the wire to connect to the resistive element from above while the lead-out line remains on the substrate, creating overlapping but spatially separated current paths that reduce parasitic inductance without requiring complex planar routing
2Measurement precision
If wire connection portions are arranged laterally of the resistor between lands with wire crossing voltage sensing line, then parasitic inductance is suppressed, but wire forming step becomes difficult to perform
Solution Approach 1:
The patent divides the electrical connection into two separate segments: a lead-out line portion on the substrate that connects to one voltage terminal, and a separate wire above the substrate that connects to the other voltage terminal. This segmentation allows each component to be formed and positioned independently, simplifying the manufacturing process while maintaining the benefit of reduced parasitic inductance through spatial separation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses parasitic inductance errors, improving current sensing accuracy with a simpler structure and reduced manufacturing complexity.
Implementation Method 1
mutual inductance is caused between the line patterns and a resistive element in that portion. In this way, an induced voltage due to the inductance of the resistive element is cancelled
Data Source
AI summary
A shunt resistor mounting structure comprising: a resistor including a pair of terminal portions and adapted to perform current sensing; and a mounting board. The mounting board includes: a mounting portion including a pair of a first land and a second land to which the pair of terminal portions are respectively connected, and which allow a current to be measured to flow through the resistor; a substrate having the pair of lands formed thereon; a first voltage terminal formed on the substrate and including a line pattern led out from the first land; and a second voltage terminal including a wire connected to the terminal portion corresponding to the second land.